The Genuine BMW Washer-Gasket - 51127172542 is a small rubber seal that is used to create a watertight connection between two surfaces, typically between a bolt and a nut or between a bolt and a metal or plastic component. It is an official BMW product, designed specifically for use in BMW vehicles. This washer-gasket helps to prevent leaks and maintain the integrity of the connection. It is made of high-quality materials and is designed to fit perfectly within the designated space. This product is essential for proper functioning and maintenance of BMW vehicles.